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就是CentOS 7 使用

yum install cronie
而 CentOS 6 需要更多一个

yum install vixie-cron cronie
或者
yum install crontabs
crontab基本使用
查看crontab服务状态
[root@localhost ~]# service crond status
[root@localhost ~]# systemctl status crond.service
开启crontab
[root@localhost ~]# service crond start
[root@localhost ~]# systemctl start crond.service

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